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by Dowdy, Penny.
Publication:
St. Catharines, Ont. : Crabtree Pub., 2009
. 24 p. :
, Includes index. | "Math concepts made simple"--Cover.
29 cm.
Date:2009
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How did we find out about numbers?
by Asimov, Isaac,
Publication:
New York, Walker 1973
. 63 p.
22 cm.
Date:1973
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Place value /
by Adler, David A.,
Publication:
. 29 pages :
26 cm.
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(1),
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